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/*
RCC-Project
Copyright (C) 2026 Richard Qin
This file is part of RCC-Project.
RCC-Project is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your option) any
later version.
RCC-Project is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
RCC-Project; see the file COPYING. If not see
<http://www.gnu.org/licenses/>.
*/
#include "bios.h"
#include "io.h"
#define PIT_COUNTER0 0x0040u
#define PIT_COMMAND 0x0043u
#define PIT_SELECT_CHANNEL0 0x00u
#define PIT_ACCESS_WORD 0x30u
#define PIT_MODE_2 0x04u
#define PIT_BINARY 0x00u
#define PIT_COMMAND_CHANNEL0_MODE2 \
(PIT_SELECT_CHANNEL0 | PIT_ACCESS_WORD | PIT_MODE_2 | PIT_BINARY)
void pit_init(void)
{
io_out8 (PIT_COMMAND, PIT_COMMAND_CHANNEL0_MODE2);
/*
* A divisor of zero represents 65536.
*/
io_out8 (PIT_COUNTER0, 0x00u);
io_out8 (PIT_COUNTER0, 0x00u);
}
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